Update changelog for M8

Change-Id: I8e50b811f3798c6f4cd21b8196f71502e8d0aea8
Merge "Update changelog for M8" into cm-11.0
Revert "cm: Add some app-specific performance settings"

This reverts commit 34d5e908433ce79e1c7fbcb88cf1661a4adb1743.
Persist DPI & Xposed across flash
Add OmniSwitch & Clean up

- Remove CM Updater
- Remove CM Wallpaper
- Remove LockClock
New bootanimation